all components: change strcpy() to strlcpy() when possible.

This commit should cover the client and manager code.
Mac uninstaller: localize the dialog strings in the Uninstall BOINC app.
LOC: Update translation files
LOC: Fix bug reported when using Italian on Debian
Linux: the Linux file system layout on Debian?/Ubuntu appears to be going through some changes.  libxcb-dpms.so is now located in /usr/lib/{i686-linux-gnu|x86_64-linux-gnu}.  sah_check_lib.m4 was not able to find that library during its checks.
Linux: Revert previous change, it did not have the desired effect.